> ## Documentation Index
> Fetch the complete documentation index at: https://docs.digitalasset.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Token Standard off-ledger API

In order to interact with the Registry App over [CIP-56](https://github.com/canton-foundation/cips/blob/main/cip-0056/cip-0056.md), certain contract disclosures need to be sourced via an off-ledger API.

These endpoints are specific to each instrument admin, and are exposed with the following base URL:

<Tabs>
  <Tab title="MainNet">
    ```text theme={null}
    https://api.utilities.digitalasset.com/api/token-standard/v0/registrars/<admin-party-id>
    ```
  </Tab>

  <Tab title="TestNet">
    ```text theme={null}
    https://api.utilities.digitalasset-staging.com/api/token-standard/v0/registrars/<admin-party-id>
    ```
  </Tab>

  <Tab title="DevNet">
    ```text theme={null}
    https://api.utilities.digitalasset-dev.com/api/token-standard/v0/registrars/<admin-party-id>
    ```
  </Tab>
</Tabs>

where `<admin-party-id>` is the party identifier of the target instrument admin.

<Accordion title="Example: USDCx instrument metadata">
  The instrument admin for `USDCx` is the party `decentralized-usdc-interchain-rep::12208115f1e168dd7e792320be9c4ca720c751a02a3053c7606e1c1cd3dad9bf60ef`.

  Hence, the instrument metadata endpoint for `USDCx` on MainNet can be retrieved using the following URL

  [https://api.utilities.digitalasset.com/api/token-standard/v0/registrars/decentralized-usdc-interchain-rep::12208115f1e168dd7e792320be9c4ca720c751a02a3053c7606e1c1cd3dad9bf60ef/registry/metadata/v1/instruments/USDCx](https://api.utilities.digitalasset.com/api/token-standard/v0/registrars/decentralized-usdc-interchain-rep::12208115f1e168dd7e792320be9c4ca720c751a02a3053c7606e1c1cd3dad9bf60ef/registry/metadata/v1/instruments/USDCx).
</Accordion>

## Instrument admin discovery

There is currently no standardized way to discover the set of instrument admins, and their respective instruments.